Motor-control system.



PATENTED OCT. 29. 1907,

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M. W. DAY:

MOTOR CONTROL SYSTEM.

APPLIUATION FILED MAB 6. 1907 Wtnesses:

t nM z W jam 8 m H b i. W. DAY, OF SCHENEOTADY, NEW YORK, ASSIGNOR TO GEN JRAL ELEUTRIU (JOMZANI, A CORPORATION OF NEW YORIL MOTOR-CONTROL SYSTEM.

Specification of Letters Patent, Patent-ed Oct 28, 1907,

' Mien fi'ieri Hiai'uia 6. 1907, Serial No. 360.308.

ioi', Whik', cunncciud in the shaft A iliiuai an piniuii Bunny; W. Six 3 ciiiwu 0i .ding MHSL 13, county 01' Yuri;

impmvem i, f and gear, and magnetic clutch D. -Wii J-ii clu 60 lib he ioiiovling energized L110 momr armature (l is connected iv the i1 shaft A through the spved-ruducing gvming formed by ism'e empioymimi' driving a loud at difihe pinion'mid gemx hex; clutch. I) is d nurgizu zi arm-alum: U is disconnected imm ha driv min a 1" drive :1 load at snccds \"m represem the iivirl oi the low-sfiead inotur. The motor 65 fields and 0 maybe cxciu iiiowlyfrom-Um cozismm puucnziul mains E. mated iu the lufki driven by the col A irpm the mains Y The gcnemu 5 79 I 1v w n:- and, the coils 2111,:

connected in circui :li-Ciy w 1'02]: a censwm yuten- L11 i high-speed inowrs are emmi, ICSPQLtiVPi meter general Oi set purpose of Air sul'iGs wiiidin wok-age. Bu; load from ui'iuuing lilZ SPLL nicsL iuzwinnhor cxpi u'-, it(:ii for varyiiig the {i and for controlling Lilo cumieciioiix iiio nwuws and ciutsh D. NPXCSQIFz' a Ym'iiiflu 1' iUlkfL udapimi 30 for connemio in he main iicidf 01' die genemmix J ruprescnt a l'iYQl'S'iF-g a ii/(Iii.

The swinches H. and J are 110 v be load, reversing a 4.10

7 1:; 5331's. da- 3 3011 oi the generals: vuiand the i (no; to thy biker is "first upeiming p0 mm'ed w bring Suerig engagement Sis mowedmi 5 JU- kiie generamr i wzndiaigf is :1 the lower main 1i, 1 uugh the llCiKi xximxingj} 1 ail 0f resistance I, 1.01M- ispper 15mm :rie: 1.0 film constant posame time a circuit is ciused inrm the led. ii i'vpi'csms n.

. me h'miflitioii we minimum um die 1 l peed mot-31 and ii is i .w

' nmneousl 1mm 1 1:;

U in.

4f sacounter- 0L" gnermgr F through SfliGS winding f, mu d on Lin: SWiLCh J, motor armaiure U, swimh ii, win-h 3. lower :btlwflrll ihc vUimL L-ni line wire E to the 1' QJJKi brush oi geneimu i A Thur, inmuk. g third vi'zcuii is sad. mm the imw'r main E Juizgii 401' 11:0 highcluu'h-windi D and swi'lxcii .H, 131' main i im-Limum vui- 5.11100 all iuiifi l is inch-d 331 min field i 0f the gone penni g at is n I Li (e the X'LiiU 'f'Ki} @E iur c'unnectcd a 3 me Q, and :tluith ,Mi'ifililliflilifi. Mi, tlie xmmr L m. ves Lhe iow'i at minimum speed. I. mm'ii i 1&5

i [nice p05 ions of circuii; thereby imi Lml and the v. i. at-vr C, E fourth 0 {he 1 posiaion 01" 3 ciufch D izbbn 1; thereby HG and. the right-hand brush, through field Winding f,

- tage and speed of motor armature l5.

speed motor from the load, and at the same time a circuit is closed from the lower main 1'1 to the leitdrand brush of generator F, through the generator armature switch J, motor armature ll, switclrJ. switch ll, to on per main E. tkmsequently. motor armature generator armaliu'e l are connected in series to the The relative polarities constant potential mains E. of the mains and of the generator are indicated pressed on motor armature ll is the difference l ll and by plus andminus signs. It \vill'he seen that the voltage im- :etween the voltage of the mains and the generator voltage. Since the generator voltage is at its maximumvalue, a small voltage is impressed on the motor armature l5. (lonseqtxently, this motor operates at its minimum speed, which is approximately equal to the maximum speed of the motor ratio. The transition from one motor to the othethus made smoothly and withontfialtering the potenlizn armature (l multiplied by the gear of the generator. As switch ll is moved through its further positions resistance I is again gradually cut into the circuit of field \vindingf, thereby reducing the generator voltage and increasing theimpressed vol- Motor armature (I may he left connected across the generator terminals, so that it runs idle, While the high-speed motor is operatingr, but on the reverse movement of switch H. is brought up to its maximum speed so as to take up the 5 load when the circuit of the highspeed motor in passing from the fifth to the fourth positioi switch.

It will he seen that when the lOl.-S[)Q(J(ldllt)l.l

l of the erating, the series lield Winding f of the generator is in (.l 'uit. ator for motor stant. When motor l is operating, the Windingf is the generator is new operating; to provide a This winding acts to compound the getter varying load on the motor. so as to hold the speed, when once adjusted, substantially confenerator field in circuit, and it will he noted that since counteris lvro ken l electromotive force, -or in other words, is running as r a motor. the current through field windingf opposite direction as compared with the current lion through the field windingj", when the latter circuit. Consequently, lield winding acts as a dif- I in the was in ierential Willtlill" ll) 0 )()S@ the llldlll IlliU'llOlllZlllltlll (If U11 tilt l the genca'ator. Consequently, when the load large mutt 1 13 increases, thereby increasing the current,

the voltage oi generator l is decreased with a resfi ltant increase oi impressed voltage on the motor ll. some number if the of series turns sulllces for compounding the generator, when the lowspeerl motor is running,

struction and arrangement of parts here shown, l

ieations aim in the appended claims to cover all modil which are within the scope of my invention.

atiou when a single series wind- (clrdinarily, ho\vfor the ill ordi- I lar con nit What i claim as new and desire to secure by Letter? Patent of the United States, is,---

1. In combination with nlotoi lnlnpted [0 dr a. load to be driven, an electric e the lead at low speed, -a second motor-nun ated to drive the load at a higher S'JBOl, a source of constant voltage, a source of vsaid motors arr l1 .(l motor to the source of variable voltage trolling, means for hle voltage, and c0nto connect the first: and gradually increase suid voltage, and then to connect the second motor and the source variable voltage in series to the source of constant voltage and gradually to reduce the voltage of the variable source. I

1.. In combination with a load to he driven,

lead ntrlow speed, a second motor adapted to drive the load at a higher motor adapted. to drive the an electric speed, constant potential mains, a generator provided with means lOi' varying: its voltage, and con connect the tr generator to the first motor increase its voltage, and then to connect olling means arranged to and gradually to the second motor and the generator-in series to the mains and gradually to reduce the generator voltage.

" In comblnn tion with a load to be driven, an electric motor adapted to drive the load at low-speed, a second motor adapted to drive the load it a higher speed, co

stunt. potential mains, a grenerawr provided with means for varying nect the increase nmchanlcnlly motor and the cone ually to reduce ll its voltage, and controlling means arranged generator to the first motor and.

voltage, and then to disconnect the motor from the load and to connect the utter in series to the mains and gradgenerator voltage.

to con- II lllllltlllf," to

second 4. In combination with a load to be driven, an electric motor adapted to drive the load at low between said motor and the load, a

to drive the load at voltage, a source ot' a higher speed, n 501 variable voltage, and controlll speed, a clutch mtor adapted 2 of constant second menus for said motors adapted to actuate said c lLCil and to (Luniect the lirst motor to the then of variable .vollvoltage, and then vurinhlc source.

.1 in combination with the lo motor adapted potential mai a orator vnryinn its voltage, and cont! co: lttt the generator to the fir lllt'il'tlSt: its v ltage, and then to connect the s to the mains and gr and the genera tor in series reduce the a'eneruthr motor and to oppose the main field motor adapted to drive potential mains, :2

tirst, motor I llll one ally to incrcnso the s then to connect the second motor s. nit and gradually to reduce the strength of s' to the main with the other winding.

ul-ually to increase said voltage, then to dlscnga said clutch and to connect the second rce of var-lab] eltage motor and the some;

- ln'series to the source of; constant actually to reduce the voltage of the all to be driven, an electric connected to the sccond me 6. in combination with a load to he the load at ow speed, second motor adapted to drive the load at a. l

genera tor lltltl of variable strength and two series field windlw trolling means arranged to connect the generator to drive the load at low Q cell, a second motor :ulnplcd to drive the load at a higher provided etl, constant with means or means arranged to st motor and gradt *lly to 1 motor dually to having a train field n1 connected in the l'n's. mngr -tlzution when the tlrlven, an electric and conthe ies winding in circuit and graducngt'h of the main field winding, and

id the generator in cs lleltl winding in cirthe main held In witness whereof, I lune hereunto set my hand this 5th day oi March. 1907.

Witness lilunJAAilN 13. Hunt, 1 lnnm: Onrtnul.

MAXWELL W. DAY. 

